Neutrino fast flavor instability in three dimensions
Neutrino fast flavor instability in three dimensions
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DOI：
10.1103/physrevd.104.103023
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发表时间：
2021-09
影响因子：
5
通讯作者：
S. Richers;D. Willcox;N. Ford
中科院分区：
文献类型：
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作者：
S. Richers;D. Willcox;N. Ford
中微子味道不稳定性有可能在电子、mu 和 tau 味道状态之间重新调整中微子，从而改变核心塌缩超新星机制和中子星合并中喷射出的重元素。分析方法表明存在所谓的快速风味转变不稳定性，并且可以使用数值模拟来探测中微子的非线性演化。迄今为止，对快速风味不稳定性的模拟是在假设强加对称性的情况下进行的。我们对快速风味不稳定性进行模拟，包括所有三个空间维度和所有相关动量维度，以探讨这些近似的有效性。如果增长最快的模式具有沿强加对称方向的波数，则可以抑制不稳定性。然而，风味的后期平衡分布似乎受空间维度数量的影响很小。这是一个有希望的暗示，尽管需要对更广泛的中微子分布进行模拟以更普遍地支持这一主张，但迄今为止，低维模拟的结果对其空间维度的数量具有稳健的预测。
Neutrino flavor instabilities have the potential to shuffle neutrinos between electron, mu, and tau flavor states, modifying the core-collapse supernova mechanism and the heavy elements ejected from neutron star mergers. Analytic methods indicate the presence of so-called fast flavor transformation instabilities, and numerical simulations can be used to probe the nonlinear evolution of the neutrinos. Simulations of the fast flavor instability to date have been performed assuming imposed symmetries. We perform simulations of the fast flavor instability that include all three spatial dimensions and all relevant momentum dimensions in order to probe the validity of these approximations. If the fastest growing mode has a wavenumber along a direction of imposed symmetry, the instability can be suppressed. The late-time equilibrium distribution of flavor, however, seems to be little affected by the number of spatial dimensions. This is a promising hint that the results of lower-dimensionality simulations to date have predictions that are robust against their the number of spatial dimensions, though simulations of a wider variety of neutrino distributions need to be carried out to support this claim more generally.